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import 'dart:collection'; 

Set myRecords = new  HashSet(); 

myRecords.add({'Name':'Goku'});
myRecords.add(23);
myRecords.add(45);
myRecords.add(true);
myRecords.add('potatoes');
  
for(var data in myRecords){ 
   print(data); 
}

/******** Output
  potatoes
  23
  45
  true
  {Name: Goku}
*/